H2 Ignition Trouble Shooting INDEX

H2 Ignition System

When the ignition winding voltage is at the polarity indicated in Fig. 1, capacitor charge current flows through D1, ground, up through the ignition coil primary, and to the capacitor (C). Return current is from the other side of the capacitor, this is through D2 and through either D3 or D4 (depending on rpm) back to the generator.
When the signal generator winding is at the indicated polarity, signal voltage is felt at the gate of the thyristor and the thyristor starts conducting to discharge the capacitor. Signal current is from the signal generator winding through ground, from cathode (K) to gate (G) of the thyristor (TH), and via D5 back to the generator.
After the thyristor starts conducting, the capacitor discharges through the primary winding of the ignition coil to ground and up through the thyristor. In case the motorcycle is turned off just when the capacitor is charged, resistor (R) slowly discharges the capacitor. The resistance of R is high enough (390K Ohm) so that it has negligible effect on the ignition circuit while the engine is running.

Fig 1.

Troubleshooting

These contents edited a part about H2 electric system from Shop manual H series. There are include of the part that I added in order to make it plain.

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